we already have that piece of crap...it only supports one connection!! and the program is really hard to use...in order to add one connection, you need to re-add every connection!!
What? The WRT54G (or pretty much any wireless router) should hold more than 1 wireless connection. And it shouldn't be a big deal anyways as long as your brother doesn't stream porn or torrent or anything like that, then he's hogging bandwith. If you signed up with a good ISP with a high bandwith plan, you should be fine, sort of. (The US sucks in providing internet service compared to countries in Europe, Korea, and Japan.)
Oh by the way, WRT54G/GS/GL routers are awesome. Tomato/DD-WRT firmware FTW.